/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and limitations under the License.
 *
 * =========================================================================================================
 *
 * This software consists of voluntary contributions made by many individuals on behalf of the
 * Apache Software Foundation. For more information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * +-------------------------------------------------------------------------------------------------------+
 * | License: http://www.apache.org/licenses/LICENSE-2.0.txt 										       |
 * | Author: Yong.Teng <webmaster@buession.com> 													       |
 * | Copyright @ 2013-2019 Buession.com Inc.														       |
 * +-------------------------------------------------------------------------------------------------------+
 */
package com.buession.web.reactive.filter;

import com.buession.web.reactive.http.request.RequestUtils;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.WebFilter;
import org.springframework.web.server.WebFilterChain;
import reactor.core.publisher.Mono;

/**
 * @author Yong.Teng
 */
public class MobileFilter implements WebFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain){
        if(exchange == null){
            return chain.filter(exchange);
        }

        ServerHttpRequest request = exchange.getRequest();

        if(RequestUtils.isMobile(request)){
            exchange.getAttributes().put("isMobile", true);
            return chain.filter(exchange);
        }


        final String accept = request.getHeaders().getFirst("Accept");
        final boolean isMobile = accept != null && (accept.contains("vnd.wap.wml") == true && accept.contains
                ("text/html") == false || accept.indexOf("vnd.wap.wml") > accept.indexOf("text/html"));

        exchange.getAttributes().put("isMobile", isMobile);

        return chain.filter(exchange);
    }
}
